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Q:

What is 15 of 80 with simple method and examples?

A) 12.5%	B) 18.75%
C) 16.55%	D) 17.80%

Answer & Explanation Answer: B) 18.75%

Explanation:

Given that to find 15 of 80

=> What % of 80 is 15

Let it be 'p'

=> p% of 80 = 15

=> $\frac{p x 80}{100} = 15 \Rightarrow p = \frac{15 x 100}{80} \Rightarrow p = \frac{1500}{80} = 18.75$

Therefore, 15 is 18.75% of 80 => 18.75% of 80 = 15

Example::

Now, in the similar way we can find 15% of 80 =?

=> 15x80/100 = p

=> p = 4 x 3 = 12

Therefore, 15% of 80 = 12

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Filed Under: Percentage
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Q:

12 boys decided to constribute Rs. 750 each to an Orphange. Suddenly few of them boys dropped out and consequently the rest had to pay Rs. 150 more. Then the number of boys who dropped out?

A) 4	B) 6
C) 2	D) 3

Answer & Explanation Answer: C) 2

Explanation:

Total money decided to contribute = 750 x 12 = 9000

Let 'b' boys dropped

The rest paid 150/- more

=> (12 - b) x 900 = 9000

=> b = 2

Hence, the number of boys who dropped out is 2.

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Filed Under: Average
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Q:

Present ages of Deepa and Hyma are in the ratio of 5:6 respectively. After four years, this ratio becomes 6: 7. What is the difference between their present ages?

A) 6 yrs	B) 4 yrs
C) 8 yrs	D) 2 yrs

Answer & Explanation Answer: B) 4 yrs

Explanation:

Let the present age of Deepa = 5p

Let the present age of Hyma = 6p

After four years their ratio = 6 : 7

=> $\frac{5 p + 4}{6 p + 4} = \frac{6}{7}$

=> 35p + 28 = 36p + 24

=> p = 4

Therefore, the difference between their ages = 24 - 20 = 4 years.

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Filed Under: Problems on Ages
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Q:

A passenger train covers the distance between station K and L, 40 minutes faster than a goods train. Find this distance between K and L if the average speed of the passenger train is 50 km/h and that of goods train is 30 km/h?

A) 50 kms	B) 48 kms
C) 46 kms	D) 44 kms

Answer & Explanation Answer: A) 50 kms

Explanation:

Let the distance be 'd' kms.

According to the given data,

$\frac{d}{30} - \frac{d}{50} = \frac{40}{60} hrs = > 6 d = 300 = > d = 50 kms .$

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Filed Under: Problems on Trains
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Q:

In a 100 litre of mixture the ratio of milk and water is 6:4. How much milk must be added to the mixture in order to make the ratio 3 : 1?

A) 85	B) 60
C) 55	D) 45

Answer & Explanation Answer: B) 60

Explanation:

Let M litres milk be added

=> $\frac{60 + M}{40} = \frac{3}{1}$

=> 60 + M = 120

=> M = 60 lit.

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Filed Under: Alligation or Mixture
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Q:

In the given number series which follows the definite rules then find out the value of (M, N, O, and P) in second number series.

7 18 42 94 204

4 M N O P

What value will come in place of P?

A) 179	B) 184
C) 164	D) 156

Answer & Explanation Answer: D) 156

Explanation:

Here the given series 7 18 42 94 204 follows a pattern that,

7

7 ×2+4 = 18

18 ×2+6 = 42

42 ×2+10 = 94

94 ×2+16 = 204

Similarly,

4

4 ×2+4 = 12

12 ×2+6 = 30

30 ×2+10 = 70

70 ×2+16 = 156

Hence, the value of P = 156.

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Filed Under: Odd Man Out
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Q:

Which dml command is used in conjunction with @@identity?

A) INSERT and UPDATE	B) UPDATE and DELETE
C) SCOPE_IDENTITY and IDENT_CURRENT	D) Commit and rollback

Answer & Explanation Answer: C) SCOPE_IDENTITY and IDENT_CURRENT

Explanation:

Using automatically incrementing IDENTITY columns is very popular with database developers. You don’t need to explicitly calculate unique surrogate keys when inserting new data, the IDENTITY column functionality does that for you. The IDENTITY feature also allows you to specify useful Seed and Increment properties. When you use an INSERT statement to insert data into a table with an IDENTITY column defined, SQL Server will generate a new IDENTITY value.

You can use the @@IDENTITY variable and the SCOPE_IDENTITY and IDENT_CURRENT functions to return the last IDENTITY value that has been generated by SQL Server. This is very useful when you need to return the key for the row that has just been inserted, back to the caller.

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Filed Under: Oracle Certification
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Q:

What loses its head every morning and gets it back every night?

A) Pillow	B) Candle
C) Moon	D) Light

Answer & Explanation Answer: A) Pillow

Explanation:

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Filed Under: Logic Puzzles
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